二连盆地洪浩尔舒特凹陷洪10区块精细沉积学研究
发布时间：2018-10-05 18:40
【摘要】：为了阐明二连盆地洪浩尔舒特凹陷重点区块沉积砂体分布特征以及更好地指导油气精细勘探,在层序地层学和现代沉积学理论指导下,依据地震反射终止关系、岩性、沉积构造及其序列以及测井相特征,将二连盆地洪浩尔舒特凹陷白垩系阿尔善组划分为包含低位、湖侵及高位体系域的一个完整三级层序。高位体系域主力产油层段可划分为3个准层序组(砂组)和10个准层序(小层),且每个小层均发育了近岸水下扇和辫状河三角洲。近岸水下扇岩性为块状砂砾岩,发育块状和递变层理、叠覆冲刷,与暗色泥岩伴生构成间断正韵律;辫状河三角洲岩性为发育中型、大型楔状交错层理及冲刷面的砂岩,呈间断正韵律。随着湖平面升降,近岸水下扇和辫状河三角洲发生进积和退积,其中阿尔善组Ⅱ砂组沉积时期物源供给充足,形成规模较大的砂体,因此Ⅱ砂组可作为洪10区块阿尔善组的重点勘探层段。
[Abstract]:In order to elucidate the distribution characteristics of sedimentary sand bodies in key blocks of Honghao'ershute depression in Erlian Basin and better guide oil and gas fine exploration, under the guidance of sequence stratigraphy and modern sedimentology theory, according to the termination relation of seismic reflection, lithology is obtained. Sedimentary structures, their sequences and logging facies are used to divide the Cretaceous Alshan formation in Honghao'ershute depression, Erlian Basin, into a complete third-order sequence containing the lowstand, lacustrine transgressive and highstand system tracts. The main oil-producing strata in the high system tract can be divided into 3 quasi sequence groups (sand formation) and 10 quasi sequences (small layers), each of which has developed nearshore underwater fan and braided river delta. The nearshore underwater fan lithology is a massive sand-gravel rock with block and progressive bedding, overlying and scouring, and accompanies with dark mudstone to form a discontinuous regular rhythm, and the braided river delta lithology is a medium developed sandstone with large wedge-shaped interlaced bedding and scour surface. A discontinuous positive rhythm. With the rise and fall of the lake level, progradation and retrogradation occur in the nearshore underwater fan and braided river delta. During the deposition period of the second sand formation of the Alshan formation, there is a sufficient supply of provenance, resulting in the formation of a large scale sand body. Therefore, sand formation 鈪，
本文编号：2254454
[Abstract]:In order to elucidate the distribution characteristics of sedimentary sand bodies in key blocks of Honghao'ershute depression in Erlian Basin and better guide oil and gas fine exploration, under the guidance of sequence stratigraphy and modern sedimentology theory, according to the termination relation of seismic reflection, lithology is obtained. Sedimentary structures, their sequences and logging facies are used to divide the Cretaceous Alshan formation in Honghao'ershute depression, Erlian Basin, into a complete third-order sequence containing the lowstand, lacustrine transgressive and highstand system tracts. The main oil-producing strata in the high system tract can be divided into 3 quasi sequence groups (sand formation) and 10 quasi sequences (small layers), each of which has developed nearshore underwater fan and braided river delta. The nearshore underwater fan lithology is a massive sand-gravel rock with block and progressive bedding, overlying and scouring, and accompanies with dark mudstone to form a discontinuous regular rhythm, and the braided river delta lithology is a medium developed sandstone with large wedge-shaped interlaced bedding and scour surface. A discontinuous positive rhythm. With the rise and fall of the lake level, progradation and retrogradation occur in the nearshore underwater fan and braided river delta. During the deposition period of the second sand formation of the Alshan formation, there is a sufficient supply of provenance, resulting in the formation of a large scale sand body. Therefore, sand formation 鈪，
本文编号：2254454
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